Answers

@kustaa_2, Kindly visit the folder shared with me. There you can find your two document which is shared with you by other user. After that select remove me share from gear drop-down menu. Kindly refer below image.

@kustaa_2,Generally it is not happening refer below image. Kindly check created by me option. Check number of document in "Created by me" folder. If there is less than 10 document then that may be bug. Can you please open a support ticket and
give some more details to Onshape support team they definitely help you.

Ah, I could have sworn that I had just emptied the trash but as my wife can testify I don't always do that thanks! The symmetry of 10 visible documents and 10/10 private documents made my brain fart...